gf-agent-contributor

gf-agent-contributor is a skill for Claude Code, Codex from brucemcpherson/gas-fakes. It costs 40 tokens per session (870 once invoked), scanned A, original, MIT.

A guide for adding modular knowledge to gfagent, an agent that writes Google Apps Script automation code.

In plain words
What is it for?
It helps developers add new advice and warnings to the agent's knowledge base and prepare the required local Git workspace.
Why use it?
It avoids editing a generated file directly, which could be overwritten or cause merge conflicts between contributors.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: mentions Gemini CLI.

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is node gf_agent/scripts/builder.js.

Good fit It helps developers add new advice and warnings to the agent's knowledge base and prepare the required local Git workspace.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/brucemcpherson/gas-fakes
agentmods
npx agentmods add skills/brucemcpherson/gas-fakes/gf-agent-contributor

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for gf-agent-contributor

README.md
[![agentmods](https://agentmods.dev/badge/skills/brucemcpherson/gas-fakes/gf-agent-contributor/github.svg)](https://agentmods.dev/skills/brucemcpherson/gas-fakes/gf-agent-contributor)
Your own site
<a href="https://agentmods.dev/skills/brucemcpherson/gas-fakes/gf-agent-contributor"><img src="https://agentmods.dev/badge/skills/brucemcpherson/gas-fakes/gf-agent-contributor/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for gf-agent-contributor

Your own site · 80×15
<a href="https://agentmods.dev/skills/brucemcpherson/gas-fakes/gf-agent-contributor"><img src="https://agentmods.dev/badge/skills/brucemcpherson/gas-fakes/gf-agent-contributor.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 40 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 870 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00040 $0.00870
Opus 5 $0.00020 $0.00435
Sonnet 5 $0.00008 $0.00174
Haiku 4.5 $0.00004 $0.00087

Measured 10d ago against content hash f03cb3d893b6, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

gf-agent-contributor scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

gf_agent/gf-agent-contributor/SKILL.md · 57 lines

How it starts

The opening of the file, as written. The whole thing — 57 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Skill: gf-agent-contributor

Overview

This skill provides instructions on how to correctly contribute knowledge, best practices, or API parity warnings to the gf_agent so that it learns how to write better Google Apps Script automation code.

The Architecture

To prevent Git merge conflicts between multiple developers, the monolithic gf_agent/SKILL.md file is auto-generated. You MUST NOT edit gf_agent/SKILL.md directly.

Instead, gf_agent uses a modular knowledge base. The builder.js script aggregates all markdown files in the gf_agent/knowledge/ directory and appends them to a base template (gf_agent/scripts/SKILL.template.md).

How to Contribute Knowledge

When you need to teach gf_agent something new, you must first ensure you are working from a local Git clone, NOT the cached Gemini skills folder.

  1. Clone the gf_agent Environment (Sparse Checkout): Because gf_agent is a subfolder of the larger gas-fakes repository, you should use Git's Sparse Checkout feature to download only the gf_agent directory.

    🤖 Agent Instruction: If the user is not yet in a configured workspace, offer to run the sparse checkout setup for them! If they agree, use run_shell_command to execute this exact sequence (adjust the parent directory if they specify one):

    mkdir gf_agent_standalone && cd gf_agent_standalone
    git init
    git remote add origin https://github.com/brucemcpherson/gas-fakes.git
    git config core.sparseCheckout true
    echo "gf_agent/*" >> .git/info/sparse-checkout
    git pull origin main
    gemini skills link ./gf_agent
    

    (If the user prefers to do it manually, provide them the script above).

  2. Create a Modular File: Navigate to the gf_agent/knowledge/ directory inside your new standalone environment. Create a new markdown file for your topic.

    • Use a numeric prefix to ensure it sorts correctly during compilation if order matters (e.g., 06-new-feature.md). If it is a standalone topic, any descriptive name is fine.

Read the full file on GitHub · 57 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 10d ago First seen · 57 lines · 40 tokens per session scan A f03cb3d893b6

Subscribe to this mod's changes

gf-agent-contributor is a skill published in the GitHub repository brucemcpherson/gas-fakes (79 stars, last pushed 3d ago), licensed MIT. It adds 40 tokens to every session and 870 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-01.

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